I am a former evangelical Christian, and I want to encourage you to not give up. Keep up the apologetics and the testimony!
I am Catholic today because of a lot of good Catholics who continued to talk to me not only about apologetics but about their personal relationship with Jesus in the Catholic Church.
Remember that evangelicals have been taught from birth that they are right. It’s really, really hard to get past that. Think about how you feel when someone tries to convince you that your beliefs are flawed. It’s not that they’re being stubborn and closed-minded. They’re just committed to believing what is right and they don’t want to fall into error.
But for that reason, I believe that evangelicals, of all the Christians, are more likely to embrace Catholicism once they become convinced that it’s right. They have been taught all their lives to give up everything for Jesus, even their lives. When they realize that Jesus is leading them into the Catholic Church, His Church, they will give up everything.
Also, the fact that evangelicals know their Bibles is another reason that they will become Catholic if continue to they talk with knowledgeable Catholics (like you). The Catholic Church is completely Biblical, and they will see that. My husband and I saw it. So did our daughter. It’s the people that DON’T know their Bibles who will be hard to convince. But if you truly know your Bible, you will see the entire salvation history and eventually understand that the Catholic Church is part of God’s plan.
Please don’t get discouraged. I agree that you will plant seeds that may not grow to maturity for many years. I think the first seeds to becoming Catholic were planted in my life back when I was just a child, and my parents bought some Catholic school readers at a garage sale. I loved those books and the Catholic stories. And all along the way in my life, other Catholics planted more seeds, often just by being nice and not saying anything about their faith.
It took forty years for me, but it was worth the wait. Please be willing to wait 40 years, at least, for the people you talk to.